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Published on: December 19, 2025
[Lung involvement in leptospirosis]
E Márquez-Martín1, B Valera-Bestard, R Luque-Márquez
1Unidad Médico-Quirúrgica de Enfermedades Respiratorias, Hospital Universitario Virgen del Rocío, Sevilla, Spain.
Abstract:
We reviewed a series of 5 cases of leptospirosis treated in our hospital between 1998 and 2004 and found that lung involvement was observed in 3 of the 5 cases. All patients met the criteria for the diagnosis of leptospirosis. Weil syndrome was diagnosed in 4 patients and anicteric leptospirosis in 1 patient. The 3 patients with lung sequelae were admitted into the intensive care unit because of severe respiratory failure. All patients responded to antibiotic treatment; 3 received doxycycline and 2 received doxycycline with penicillin G. Leptospirosis can lead to severe lung complications often requiring admission to the intensive care unit. The degree of severity is independent of the particular clinical syndrome (the anicteric form or Weil syndrome). Finally, despite the severity of the clinical picture, our patients responded to medical treatment and did not require invasive mechanical ventilation.
Insights
Leptospirosis can cause severe lung complications, even in milder forms. Prompt antibiotic treatment is effective, often avoiding the need for mechanical ventilation in critical cases.
Area of Science:
- Infectious Diseases
- Pulmonology
- Critical Care Medicine
Background:
- Leptospirosis is a zoonotic bacterial infection with a wide spectrum of clinical presentations.
- Pulmonary involvement is a known complication, but its frequency and severity in different clinical forms require further elucidation.
Observation:
- A review of 5 leptospirosis cases (1998-2004) revealed significant lung involvement in 3 patients (60%).
- Severe respiratory failure necessitated intensive care unit (ICU) admission for these 3 patients.
- Weil syndrome was diagnosed in 4 patients, and 1 had anicteric leptospirosis.
Findings:
- Lung complications occurred in both Weil syndrome and anicteric leptospirosis, indicating severity is not solely dependent on the clinical syndrome.
- All patients with lung involvement responded well to antibiotic therapy (doxycycline or doxycycline with penicillin G).
- None of the severe cases required invasive mechanical ventilation.
Implications:
- Leptospirosis poses a significant risk for severe pulmonary complications, underscoring the need for early diagnosis and management.
- Aggressive antibiotic treatment appears effective in managing severe lung manifestations, potentially preventing the need for mechanical ventilation.
- Clinicians should be vigilant for respiratory compromise in leptospirosis patients, irrespective of the specific clinical syndrome observed.
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